It is called an isosceles triangle.
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In an isosceles triangle, two of the angles are the same.
Yes because all angles in any triangle add up to 180 degrees.
Equilateral: All angles the same Isosceles: Two angles the same Scalene: No angles the same
An Isosceles triangle has two sides that are the same and two angles that are the same.
It is not an axiom, but a theorem.